松辽盆地西南部姚家组下段局部排泄源特征及与铀矿化关系分析  

Characteristics of Local Discharge Source and Its Relationship With Uranium Mineralization in the Lower Member of Yaojia Formation in the Southwest of Songliao Basin

作　　者：唐国龙 禹宝利[1] 张亮亮[1] 蔺鹏飞 黄笑 余弘龙 TANG Guolong;YU Baoli;ZHANG Liangliang;LIN Pengfei;HUANG Xiao;YU Honglong(Geologic Party No.243,CNNC,Chifeng,Inner Mongolia 024000,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000

出　　处：《铀矿地质》2024年第3期404-416,共13页Uranium Geology

基　　金：中国核工业地质局项目“松辽盆地通辽-大庆地区铀矿资源调查评价与勘查”(编号:202212)资助。

摘　　要：松辽盆地西南部上白垩统姚家组下段含水层是重要的铀矿化区域。为了深入了解该地区的铀成矿机制,文章采用水文地质分析、放射性元素含量测定、水化学特征分析等手段,结合区域构造和含水层结构研究,对姚家组下段局部排泄源及其与铀矿化的关系进行了深入研究。研究揭示了姚家组下段具备完整的补给-径流-排泄体系;补给区大面积发育潜水氧化带,径流区发育层间氧化带;更重要的是,确定了局部排泄源为隐伏排泄源,并发现含矿含水层地下水向上部第四系含水层排泄过程中,在局部排泄源区域引起了一系列水文地质特征的变化。局部排泄源的空间存在对铀矿化形成具有控制作用,这为松辽盆地西南部铀矿的进一步勘探提供了重要的理论依据。The aquifer in the lower member of the Upper Cretaceous Yaojia Formation in the southwestern part of the Songliao Basin is an important target for uranium mineralization.In order to deeply understand the uranium mineralization mechanism in this area,this paper studied the characteristics of local discharge sources in the lower member of the Yaojia Formation and its controlling effect on uranium mineralization.Hydrogeological analysis,determination of radioactive element content,analysis of hydrochemical characteristics and other means,the local excretion sources and their relationship with uranium mineralization were studied in depth combined with the study of regional structure and aquifer structure.The study revealed that the lower member of the Yaojia Formation is of complete recharge-runoff-discharge system.large areas diving oxidation zone are developed in the recharge area,and interlayer oxidation zone are developed in the runoff area.More importantly,a local discharge source was identified in the runoff area as a hidden discharge source which was found causing a series hydrogeological characteristics changes in the local discharge source area during the discharge of groundwater from the target aquifer to the upper Quaternary.Because the spatial presence of local discharge sources has a controlling effect on the formation of uranium mineralization,therefor.the hidden discharge source provides an important theoretical basis for further exploration of uranium deposits in the southwestern part of the Songliao Basin.

关 键 词：排泄源 含水层 水文地球化学 铀矿化 姚家组下段 松辽盆地西南部 

分 类 号：P619.14[天文地球—矿床学]